Force sensing value calibration device capable of continuously loading and calibration method

Abstract

The invention relates to a force sensing value calibration device capable of continuously loading and a calibration method thereof. The device comprises a main machine frame, a weight loading and unloading system, a weight, a reverser, a movable cross beam, a force sensing value calibration mechanism, a hanging mechanism and a control system. The weight with the corresponding mass at the common measuring point of the equipment is loaded to the weighed equipment through the weight automatic loading and unloading unit; the force sensing value calibration mechanism generates a force value or an equivalent mass value equal to the force sensing value of the calibrated weighing equipment and loads the force value or the equivalent mass value to the weighing equipment step by step, and the force sensing value calibration mechanism controls the driving current source to output proper current through the control unit according to the electromagnetic force law. The current generates an electromagnetic force matched with the force sensing value of the calibrated weighing equipment through the coil, and the electromagnetic force acts on the weighing equipment; the technical problems that according to a traditional mode, weights are usually adopted as a standard force source, different sensing values can be achieved only by replacing multiple strings of weights of different specifications, and the applied force value / equivalent mass value can only be a discrete point are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high-precision weighing, and in particular to a force sensing quantity calibration device capable of continuous loading and a calibration method thereof. Background Art

[0002] With the development of technology, large-mass and high-precision weighing equipment is increasingly used. Force sensitivity, as the minimum force change that a weighing equipment can sense, is increasingly used within the full range. At the same time, the actual force sensitivity of some weighing equipment is difficult to determine within the full range.

[0003] At present, weighing equipment is mainly used to verify or calibrate the measurement characteristics of the equipment, such as measurement error, repeatability error, eccentric load / orientation error, sensitivity, etc. There is no corresponding device and method for calibrating the force sensitivity of the equipment. Therefore, it is very necessary to invent a force sensitivity calibration device.

[0004] In the traditional weighing field, the standard force source generally comes from standard weights. Its advantages are stable force value, mature technology and low cost of low-grade weights. Its disadvantages are that the standard force value generated is limited by the number of weights, and the standard force value generated must be discontinuous and limited to a few measuring points. A large number of small weights are needed to measure the force sensitivity for different graduation values. It is also easy to produce vibration, reverse stroke and other problems during automatic loading. Summary of the invention

[0005] In view of this, the present application provides a continuously loadable force sensing calibration device and a calibration method thereof, which uses electromagnetic force instead of weights as a standard force source in the force sensing calibration process, thereby avoiding the disadvantages of using weights.

[0006] According to one aspect of the present application, a continuously loadable force sensing calibration device is provided, comprising a main frame, a weight loading and unloading system, weights, a reverser, a movable crossbeam, a force sensing calibration mechanism, a hanging mechanism and a control system; the main frame is a hollow upper and lower double-layer structure, and the upper layer of the main frame is provided with a plurality of sliding screws; the weight loading and unloading system is provided on the lower layer of the main frame, and the weight loading and unloading system is provided in two rows, located on the left and right sides of the lower layer of the main frame; the number of the weights is provided in plurality, the weights are placed on the weight loading and unloading system under unloading conditions, and the weights are placed on the hanging mechanism by the weight loading and unloading system under loading conditions; The movable crossbeam is arranged on the upper layer of the main frame, is suitable for placing the weighing equipment to be calibrated, and can move up and down; the reverser is arranged on the upper layer of the main frame, and passes through both sides of the movable crossbeam; the hanging mechanism is a rod-shaped structure, and one end of the hanging mechanism can pass through the top of the lower layer of the main frame and connect with the bottom of the reverser; the force sensing calibration mechanism is arranged on the sliding screw and is located between the reverser and the top of the upper layer of the main frame, and the force sensing calibration mechanism can pass through the top of the reverser and contact with the weighing equipment to be calibrated, and is suitable for generating electromagnetic force; the control system is electrically connected to the force sensing calibration mechanism and the weight loading system.

[0007] In a possible implementation, the force sensitivity calibration mechanism includes an electromagnetic shielding shell, an S magnetic conductive structure, a cylindrical permanent magnet, an N magnetic conductive column and a moving part; the electromagnetic shielding shell is a hollow square structure, and an opening is provided at the lower end of the electromagnetic shielding shell; the S magnetic conductive structure is a hollow structure with an opening at the lower end, the S magnetic conductive structure is arranged inside the electromagnetic shielding shell, and the upper end of the S magnetic conductive structure is fixedly connected to the upper end of the electromagnetic shielding shell; the cylindrical permanent magnet is arranged inside the S magnetic conductive structure and fixedly arranged at the upper end of the S magnetic conductive structure; the N magnetic conductive column is arranged inside the S magnetic conductive structure, and the N magnetic conductive column is fixedly connected to the cylindrical permanent magnet; the moving part is arranged between the N magnetic conductive column and the S magnetic conductive structure, the number of the moving parts is two, and the two moving parts are electrically connected.

[0008] In a possible implementation, the force sensitivity calibration mechanism also includes a supporting conductor structure and an electromagnetic force pressure head; the supporting conductor structure is arranged at the lower end of the outside of the electromagnetic shielding shell, the supporting conductor structure is a hollow structure, and a hole is opened at the lower end of the supporting conductor structure; the electromagnetic force pressure head passes through the hole of the supporting conductor structure and is located outside the supporting conductor structure, and the electromagnetic force pressure head is electrically connected to the two moving parts.

[0009] In a possible implementation, the moving component includes an A coil and a B coil, and the A coil and the B coil are alternately bonded, and the A coil at the lower end of one moving component is electrically connected to the B coil at the lower end of another moving component.

[0010] In a possible implementation, the force sensing calibration mechanism also includes wiring and a current control unit, and the current control unit is arranged inside the supporting conductor structure, and the A coil current end at the lower end of one of the moving parts and the B coil current end at the lower end of the other moving part are both connected to the current control unit.

[0011] In a possible implementation manner, the materials of the wiring and the supporting conductor mechanism are both elastic materials.

[0012] In a possible implementation, a plurality of trays are provided on the hanging mechanism.

[0013] A force sensing quantity calibration method uses the above-mentioned continuously loadable force sensing quantity calibration device, places the weighing equipment to be calibrated on a moving crossbeam, controls the telescopic rod between the reverser and the top of the frame, releases the reverser, and makes it fall on the weighing equipment to be calibrated, selects the measuring point to be calibrated, and loads the corresponding weight onto the hanging rod through the weight loading mechanism, the hanging rod is connected to the reverser, and the force value of the weight is loaded onto the weighing equipment to be calibrated through the reverser; then adjusts the position of the force sensing quantity calibration mechanism so that the force sensing quantity calibration mechanism contacts the weighing equipment to be calibrated; calibrates the force sensing quantity through the force sensing quantity calibration mechanism; unloads the weight, gradually reduces the driving current of the force sensing quantity calibration mechanism, makes the force value loaded on the weighing equipment to be calibrated zero, rotates the weighing equipment, and repeats the above process.

[0014] In a possible implementation, the weight is unloaded, the driving current of the force sensing calibration mechanism is gradually reduced, and the force value loaded on the weighing device to be calibrated is made zero. The rotation of the weighing device also includes: first, clearing the initial force value generated by the force sensing calibration mechanism on the weighing device to zero; second, selecting a suitable current according to the nominal graduation value of the weighing device to be calibrated. When the resolution is 1×10 k When the scale value is 2×10 k When the current is 1 to 5 times the value, the current is applied step by step; when the division value is 5×10 k When the current is 1 to 2 times the value, the current is selected and applied step by step; thirdly, the current corresponding to the 50 times the scale value and the 500 times the scale value is selected and applied to the electromagnetic coil, and the second step is repeated.

[0015] The beneficial effects of the present invention are as follows: a control system is set to control a force sensing calibration mechanism to calibrate the weighing device to be calibrated, a main frame, a weight loading and unloading system, weights, a reverser, a movable crossbeam, a force sensing calibration mechanism and a hanging mechanism, the main frame is an integral frame, a reverser, a hanging mechanism, a weight loading and unloading system and weights are set, in order to load the corresponding weights onto the hanging rod through the weight loading mechanism, the hanging rod is connected to the reverser, and the force value of the weights is loaded onto the weighing device to be calibrated through the reverser, the force sensing calibration mechanism is set to generate electromagnetic force, the force sensing calibration mechanism contacts the weighing device to be calibrated to release the electromagnetic force, and the weighing device to be calibrated is calibrated by controlling the electromagnetic force through the control system, and the above setting allows the electromagnetic force to replace the weights as the standard force source in the force sensing calibration process, does not require a large number of weights, and makes the calibration more convenient and quick.

[0016] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 A schematic diagram showing the specific structure of the force sensing quantity calibration device capable of continuous loading according to the present embodiment; Figure 2 A schematic diagram showing the specific structure of the force sensing quantity calibration mechanism of the force sensing quantity calibration device capable of continuous loading according to the present embodiment; Figure 3 A schematic structural diagram of the moving parts of the force sensing quantity calibration mechanism of the force sensing quantity calibration device capable of continuous loading in this embodiment is shown. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "join", "hinge", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1As shown, the continuously loadable force sensing calibration device is used to calibrate the force sensing of large mass and high precision weighing equipment, including a main frame 1, a weight loading and unloading system 3, a weight 2, a reverser 6, a moving crossbeam 5, a force sensing calibration mechanism 8, a hanging mechanism 7 and a control system 4. The main frame 1 is a hollow upper and lower double-layer structure, and the upper layer of the main frame 1 is provided with a plurality of sliding screws 9, the weight loading and unloading system 3 is arranged on the lower layer of the main frame 1, and the weight loading and unloading system 3 is arranged in two rows, located on the left and right sides of the lower layer of the main frame 1, the number of weights 2 is set to be multiple, the weights 2 are placed on the weight loading and unloading system 3 under unloading conditions, and the weights 2 are moved by the weights under loading conditions. The code loading and unloading system 3 is placed on the hanging mechanism 7, and the moving beam 5 is arranged on the upper layer of the main frame 1, which is suitable for placing the weighing equipment to be calibrated and can move up and down; the reverser 6 is arranged on the upper layer of the main frame 1 and passes through both sides of the moving beam 5. The hanging mechanism 7 is a rod-shaped structure, and one end of the hanging mechanism 7 can pass through the top of the lower layer of the main frame 1 and connect with the bottom of the reverser 6. The force sensing calibration mechanism 8 is arranged on the sliding screw 9 and is located between the reverser 6 and the top of the upper layer of the main frame 1. The force sensing calibration mechanism 8 can pass through the top of the reverser 6 and contact with the weighing equipment to be calibrated, and is suitable for generating electromagnetic force. The control system 4 is electrically connected to the force sensing calibration mechanism 8.

[0025] In a possible implementation, a plurality of weight trays are provided on the hanging mechanism 7 .

[0026] Specifically, the main frame 1, the weight loading and unloading system 3, the weight 2, the inverter 6, the force sensing calibration mechanism 8 and the hanging mechanism 7, the main frame 1 is an integral frame, the inverter 6, the hanging mechanism 7, the weight loading and unloading system 3 and the weight 2 are arranged in order to load the corresponding weight 2 onto the hanging mechanism 7 through the weight loading mechanism 3, the hanging mechanism 7 is connected to the inverter 6, the force value of the weight 2 is loaded onto the weighing device to be calibrated through the inverter 6, the force sensing calibration mechanism 8 is arranged in order to generate electromagnetic force, the force sensing calibration mechanism 8 contacts the weighing device to be calibrated to release the electromagnetic force, and the electromagnetic force is controlled by the control system 4 to load the electromagnetic force matching the force sensing of the weighing device to be calibrated step by step, so as to calibrate the force sensing of the weighing device to be calibrated, The main frame 1 is divided into two parts, the upper layer of the main frame 1 and the lower layer of the main frame 1. The weighing equipment to be calibrated is placed on the moving crossbeam 5. The top of the lower layer of the main frame 1 is provided with a hole, and the top of the hanging mechanism 7 passes through the hole and is connected to the reverser 6. The lower part of the hanging mechanism 7 has a weight tray with fixed intervals for loading the weight 2. When the device is not working, the weight 2 is placed on the weight loading and unloading system 3. When the device is working, the weight loading and unloading system 3 descends with the weight 2 until it falls on the weight tray, and acts on the weighing equipment to be calibrated together with the hanging mechanism 7 and the reverser 6.

[0027] In a possible implementation, the force sensing calibration mechanism 8 includes an electromagnetic shielding shell 81, an S magnetic conductive structure 83, a cylindrical permanent magnet 89, an N magnetic conductive column 82 and a moving part 88. The electromagnetic shielding shell 81 is a hollow square structure, and an opening is provided at the lower end of the electromagnetic shielding shell 81. The S magnetic conductive structure 83 is a hollow structure with an opening at the lower end. The S magnetic conductive structure 83 is arranged inside the electromagnetic shielding shell 81, and the upper end of the S magnetic conductive structure 83 is fixedly connected to the upper end of the electromagnetic shielding shell 81. The cylindrical permanent magnet 89 is arranged inside the S magnetic conductive structure 83 and fixedly arranged at the upper end of the S magnetic conductive structure 83. The N magnetic conductive column 82 is arranged inside the S magnetic conductive structure 83, and the N magnetic conductive column 82 is fixedly connected to the cylindrical permanent magnet 89. The moving part 88 is arranged between the N magnetic conductive column 82 and the S magnetic conductive structure 83. The number of moving parts 88 is two, and the two moving parts 88 are electrically connected. The moving part includes an A coil 84 and a B coil 86, and the A coil 84 and the B coil 86 are alternately bonded, and the A coil 84 at the lower end of one moving part 88 is electrically connected to the B coil 86 at the lower end of another moving part 88. The force sensing calibration mechanism 8 also includes a supporting conductor structure 87 and an electromagnetic force pressure head 85. The supporting conductor structure 87 is arranged at the lower end of the outside of the electromagnetic shielding shell 81. The supporting conductor structure 87 is a hollow structure, and a hole is opened at the lower end of the supporting conductor structure 87. The electromagnetic force pressure head 85 passes through the hole of the supporting conductor structure 87 and is located outside the supporting conductor structure 87. The electromagnetic force pressure head 85 is electrically connected to the two moving parts 88. The force sensing calibration mechanism 8 also includes wiring and a current control unit. The current control unit is arranged inside the supporting conductor structure 87. The current end of the A coil 84 at the lower end of a moving part 88 and the current end of the B coil 84 at the lower end of another moving part 88 are both connected to the current control unit.

[0028] Specifically, the N magnetic pole 82, the S magnetic structure 83, and the cylindrical permanent magnet 88 together constitute a uniform magnetic field. Under the control of the differential signal of the current control unit, the current end of the A coil 84 and the current end of the B coil 86 can compensate for the lateral force caused by the winding angle of the coil and generate a vertical force. The current control unit can output two currents with phase and amplitude differences, and differentially control the current difference between the current end of the A coil 84 and the current end of the B coil 86, so as to generate a vertical electromagnetic force of the required magnitude on the electromagnetic force pressure head 85. The wiring and support guide structure 87 can offset the influence of gravity on the moving part 88, and further constrain the lateral force and movement. The electromagnetic shielding shell 81 reduces the influence of magnetic field leakage on the external weight 2, and isolates the influence of external electromagnetic interference on the generation of vertical force.

[0029] In one possible implementation, the upper end of the electromagnetic shielding shell 81 has a threaded hole to fix it on the sliding screw 9, and the lower end is installed with a wiring and support guide structure 87, which can limit lateral movement and offset the influence of gravity on the moving part 88.

[0030] In a possible implementation, the materials of the wiring and the supporting conductor mechanism are both elastic materials.

[0031] A force sensing quantity calibration method uses the above-mentioned continuously loadable force sensing quantity calibration device, including the following steps: step one, placing the weighing device to be calibrated on a moving crossbeam, the control system 4 controls the telescopic rod between the reverser 6 and the top of the frame, releases the reverser 6, and makes it fall on the weighing device to be calibrated, selects the measuring point to be calibrated, and loads the corresponding weight onto the hanging rod through the weight loading mechanism, the hanging rod is connected to the reverser 6 through a double cross knife, and the force value of the weight is loaded onto the weighing device to be calibrated through the reverser 6, step two, adjusts the position of the force sensing quantity calibration mechanism so that the force sensing quantity calibration mechanism contacts the weighing device to be calibrated, step three, calibrates the force sensing quantity through the force sensing quantity calibration mechanism, step four, unloads the weight, gradually reduces the driving current of the force sensing quantity calibration mechanism, makes the force value loaded on the weighing device to be calibrated zero, rotates the orientation of the weighing device, and repeats steps one to three.

[0032] In a possible implementation, step three further includes: first, clearing the initial force value generated by the force sensing calibration mechanism on the weighing device; second, selecting a suitable current according to the nominal graduation value of the weighing device being calibrated. k When the current is 1 to 10 times the value, the current is applied step by step, so that the force sensing calibration mechanism generates the corresponding electromagnetic force to act on the weighing equipment to be calibrated. k When the current is 1 to 5 times the value, the current is applied step by step. k When the current is 1 to 2 times the value, the current is applied step by step. Third, the current corresponding to the 50-fold and 500-fold scale values ​​is selected and applied to the electromagnetic coil, and the second step is repeated.

[0033] The calibration method described in the present application is to calibrate the indication error of the weighing equipment to be calibrated at different weighing points by direct comparison method, trace the force value / mass value to the large mass weight, and realize the force sensitivity calibration of the weighing equipment to be calibrated at different weighing points by a force sensitivity calibration device based on electromagnetic force. During calibration, the weighing equipment to be calibrated is first fixed on the moving crossbeam 5, the control system 4 selects the weight to be applied according to the calibration point and places the weight on the hanging mechanism 7 through the weight loading and unloading mechanism, the force sensitivity calibration mechanism is moved to make it contact with the bearing plane of the weighing equipment to be calibrated, and the control system 4 selects the appropriate current according to the graduation value of the weighing equipment to be calibrated, and applies it step by step to complete the force sensitivity calibration. Taking the weighing equipment with a graduation value of 10g as an example, it is necessary to apply the electromagnetic force corresponding to 10g to 100g and 500g to 600g to verify the accuracy of its force sensitivity. If there are special measurement points, the corresponding electromagnetic force can be applied as required to verify the accuracy of its force sensitivity.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A force sensing calibration device capable of continuous loading, characterized in that: It includes a main frame, a weight loading and unloading system, weights, a reverser, a moving beam, a force sensing calibration mechanism, a hanging mechanism and a control system; The mainframe frame is a hollow upper and lower double-layer structure, and the upper layer of the mainframe frame is provided with a plurality of sliding screw rods; The weight loading and unloading system is arranged at the lower layer of the main frame, and the weight loading and unloading system is arranged in two rows, located at the left and right sides of the lower layer of the main frame; The number of the weights is set to be multiple, and the weights are placed on the weight loading and unloading system under unloading conditions, and the weights are placed on the hanging mechanism by the weight loading and unloading system under loading conditions; The movable crossbeam is arranged on the upper layer of the main frame, is suitable for placing the weighing equipment to be calibrated, and can move up and down; The reverser is arranged on the upper layer of the main frame and passes through both sides of the moving beam; The hanging mechanism is a rod-shaped structure, and one end of the hanging mechanism can pass through the top of the lower layer of the main frame and connect with the bottom of the reverser; The force sensing calibration mechanism is arranged on the sliding screw and is located between the reverser and the top of the upper layer of the main frame. The force sensing calibration mechanism can penetrate the top of the reverser and contact the weighing device to be calibrated, and is suitable for generating electromagnetic force; The control system is electrically connected to the force sensing calibration mechanism and the weight loading system.

2. The continuously loadable force sensing calibration device according to claim 1, characterized in that: The force sensing calibration mechanism comprises an electromagnetic shielding shell, an S magnetic conductive structure, a cylindrical permanent magnet, an N magnetic conductive column and a moving part; The electromagnetic shielding shell is a hollow cubic structure, and an opening is provided at the lower end of the electromagnetic shielding shell; The S magnetic conductive structure is a hollow structure with an opening at the lower end, the S magnetic conductive structure is arranged inside the electromagnetic shielding shell, and the upper end of the S magnetic conductive structure is fixedly connected to the upper end of the electromagnetic shielding shell; The cylindrical permanent magnet is arranged inside the S magnetic conductive structure and fixedly arranged at the upper end of the S magnetic conductive structure; The N magnetic conductive column is arranged inside the S magnetic conductive structure, and the N magnetic conductive column is fixedly connected to the cylindrical permanent magnet; The moving component is arranged between the N magnetic conductive column and the S magnetic conductive structure. The number of the moving components is two, and the two moving components are electrically connected.

3. The continuously loadable force sensing calibration device according to claim 2, characterized in that: The force sensing calibration mechanism also includes a supporting conductor structure and an electromagnetic force pressure head; The supporting conductor structure is arranged at the lower end of the outside of the electromagnetic shielding shell, the supporting conductor structure is a hollow structure, and a hole is opened at the lower end of the supporting conductor structure; The electromagnetic force pressure head passes through the hole of the supporting conductor structure and is located outside the supporting conductor structure. The electromagnetic force pressure head is electrically connected to the two moving parts.

4. The continuously loadable force sensing calibration device according to claim 3, characterized in that: The moving part includes an A coil and a B coil, and the A coil and the B coil are alternately bonded, and the A coil at the lower end of one moving part is electrically connected to the B coil at the lower end of another moving part.

5. The continuously loadable force sensing calibration device according to claim 4, characterized in that: The force sensing calibration mechanism also includes wiring and a current control unit, and the current control unit is arranged inside the supporting conductor structure. The A coil current end at the lower end of one of the moving parts and the B coil current end at the lower end of the other moving part are both connected to the current control unit.

6. The continuously loadable force sensing calibration device according to claim 5, characterized in that: The materials of the wiring and the supporting conductor mechanism are both elastic materials.

7. The continuously loadable force sensing calibration device according to any one of claims 1 to 6, characterized in that: A plurality of trays are arranged on the hanging mechanism.

8. A force sensing calibration method, characterized in that: The method of using the continuously loadable force sensing calibration device according to any one of claims 1 to 7 comprises the following steps: Place the weighing device to be calibrated on the moving crossbeam. The control system controls the telescopic rod between the reverser and the top of the frame to release the reverser so that it falls on the weighing device to be calibrated. Select the measuring point to be calibrated. Load the corresponding weight onto the hanging rod through the weight loading mechanism. The hanging rod is connected to the reverser. The force value of the weight is loaded onto the weighing device to be calibrated through the reverser. Then adjust the position of the force sensing calibration mechanism so that the force sensing calibration mechanism contacts the weighing device to be calibrated; Calibrate the force sensing quantity through the force sensing quantity calibration mechanism; Unload the weights and gradually reduce the driving current of the force sensing calibration mechanism to make the force value loaded on the weighing device to be calibrated zero, rotate the weighing device and repeat the above process.

9. The force sensing calibration method according to claim 8, characterized in that: Unloading the weights, gradually reducing the driving current of the force sensing calibration mechanism, so that the force value loaded on the weighing device to be calibrated is zero, and rotating the weighing device position also includes: First, the initial force value generated by the force sensing calibration mechanism on the weighing device is reset to zero; Second, select the appropriate current according to the nominal scale value of the weighing equipment to be calibrated. When the resolution is 1×10 k When the scale value is 2×10 k When the current is 1 to 5 times the value, the current is applied step by step; when the division value is 5×10 k When the current is 1 to 2 times the current, the current is applied step by step; Third, select currents corresponding to 50 times the graduation value and 500 times the graduation value respectively, apply them to the electromagnetic coil, and repeat the second step.

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